QB Issue Resolution:

Just go to Customers -> Receive payments. Enter amount and in the lower left corner click “remain as available credit”. This will record payment, and it will stay as available credit. As soon as assembly will be ready and you will create an invoice – click apply credits in the upper right corner of invoice, and apply it to the invoice.

Resolution for Issue 'customer prepayments for inventory items.' available: Yes (Solved).
Source: Intuit Community forum.

customer prepayments for inventory items.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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